Andreas Gutzeit

Andreas Gutzeit
University of Zurich | UZH · Klinik für Radio-Onkologie

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93
Publications
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Publications

Publications (93)
Article
Background & Aims To determine if radiological hard- and software offers options beyond the binary female / male classification Methods We surveyed thirteen radiological hardware and six radiological software vendors about the options to enter patient gender. Results Six of thirteen hardware and five of six software vendors replied to our inquiry...
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Purpose To assess the clinical feasibility of spiral 3D Time-Of-Flight (TOF) MR Angiography (MRA) sequence variants for rapid non-contrast carotid artery imaging. Methods Nine different 3D TOF MRA sequences were acquired in nine healthy volunteers on a standard clinical 1.5 T scanner. Three cartesian sequences (fully sampled (10:15 min), accelerat...
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A survey of hospitals on three continents was performed to assess their infection control preparedness and measures, and their infection rate in hospital health care workers during the COVID-19 pandemic. All surveyed hospitals used similar PPE but differences in preparedness, PPE shortages, and infection rates were reported.
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Background and purpose: Spiral MR imaging may enable improved image quality and higher scan speeds than Cartesian trajectories. We sought to compare a novel spiral 2D T2-weighted TSE sequence with a conventional Cartesian and an artifact-robust, non-Cartesian sequence named MultiVane for routine clinical brain MR imaging. Materials and methods:...
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Purpose To investigate the diagnostic yield of low to ultra-high b-values for the differentiation of benign from malignant vertebral fractures using a state-of-the-art single-shot zonal-oblique-multislice spin-echo echo-planar diffusion-weighted imaging sequence (SShot ZOOM SE-EPI DWI). Materials and Methods 66 patients (34 malignant, 32 benign) w...
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Background: Sequences with non-Cartesian k-space sampling may improve image quality of head and neck MRI. Objective: To compare intraindividually the image quality of a spiral gradient recalled echo (GRE) sequence and conventional Cartesian GRE and Cartesian turbo spin echo (TSE) sequences for contrast-enhanced T1W head and neck MRI. Methods: This...
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Purpose: To find out how orthopaedic surgeons handle radiological reports and to identify ways to improve musculoskeletal radiology service and interdisciplinary communication. Method: An anonymised 14-question online survey was distributed among 27 orthopaedic departments in German-speaking parts of Europe. It was available to trainees and cons...
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Objectives We investigate in what percentage of cases and to what extent radiological reports change when radiologists directly communicate with patients after imaging examinations.Methods One hundred twenty-two consecutive outpatients undergoing MRI examinations at a single center were prospectively included. Radiological reports of the patients w...
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Background: The aim of the study is to investigate how well patients remember the radiologist's name after a radiological examination, and whether giving the patient a business card improves the patient's perception of the radiologist's professionalism and esteem. Methods: In this prospective and randomized two-centre study, a total of 141 patie...
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Faced with the COVID-19 pandemic, many countries both in Europe and across the world implemented strict stay-at-home orders. These measures helped to slow the spread of the coronavirus but also led to increased mental and physical health issues for the domestically confined population, including an increase in the occurrence of intimate partner vio...
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Background: Various reasons may lead to cognitive symptoms in elderly, including the development of cognitive decline and dementia. Often, mixed pathologies such as neurodegeneration and cerebrovascular disease co-exist in these patients. Diagnostic work-up commonly includes imaging modalities such as FDG PET, MRI, and CT, each delivering specific...
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Key points: • The COVID-19 crisis resulted in a variety of physical and mental health issues beyond the viral infection itself, as indicated by an increase in domestic violence.• Radiologists should be aware of typical intimate partner violence (IPV) injury patterns, actively ask potential IPV victims about the cause of injury, and be familiar wit...
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Objective: Amyotrophic lateral sclerosis (ALS) is a neurodegenerative disease with involvement of the upper and lower motor neurons. Since the loss of fine motor skills is one of the earliest signs of ALS, the hypothesis was tested if the nine hole PEG test (NHPT) and transcranial magnet stimulation (TMS) with resting-motor threshold (RMT) could b...
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In the current work two novel parameters, fiber density (FD) and mean diffusion signal (MDS) are investigated for evaluating neurodegenerative processes in amyotrophic lateral sclerosis (ALS). The MDS provides a measure of the FD but is derived directly from the diffusion signal. Using tract-based spatial statistics (TBSS), pathological changes acr...
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Purpose To identify independent confounding variables of gadoxetate-enhanced hepatobiliary-phase liver MRI using multiple regression analysis. Materials and methods The institutional review board generally approved retrospective analyses and all patients provided written informed consent. One hundred ten patients who underwent a standardized 3.0-T...
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Objectives To assess the occurrence of transient interruption of contrast (TIC) phenomenon in pulmonary computed tomography angiography (CTPA) exams performed in inspiratory breath-hold after patients were told to inspire gently. Methods In this retrospective single-centre study, CTPA exams of 225 consecutive patients scanned on a 16-slice CT scan...
Data
PlosOne anonymized English headers. Data for statistical analysis. Qualitative and quantitative data of the 225 consecutive patients with CTPA scans screened and of the 222 patients included in the final analysis. (XLSX)
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Objectives: The paucity of safety information on intrauterine devices (IUD) for magnetic resonance imaging (MRI) examinations is clinically relevant. The aim of this study is to evaluate the MRI safety of clinically used IUDs composed of copper/gold and stainless steel at 1.5T and 3.0T. Materials and methods: We assessed and compared the displac...
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Diffusion tensor spectroscopy (DTS) combines features of magnetic resonance spectroscopy and diffusion tensor imaging and permits evaluating cell-type specific properties of microstructure by probing the diffusion of intracellular metabolites. This exploratory study investigates for the first time microstructural changes in the neuronal and glial c...
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Objectives: To determine whether it would be hygienic to evaluate dogs and humans in the same MRI scanner. Methods: We compared the bacterial load in colony-forming units (CFU) of human-pathogenic microorganisms in specimens taken from 18 men and 30 dogs. In addition, we compared the extent of bacterial contamination of an MRI scanner shared by...
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Objectives: To investigate patients' perception of the radiology service when the radiologist communicates the findings to patients. Methods: After routine MRI, patients in group 1 (n = 101) were given the opportunity to discuss the findings with the radiologist. Patients in group 2 (n = 101) left the radiology department without any personal co...
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Diffusion restriction is the morphologic hallmark of acute ischemic infarcts and excitotoxic brain injury in various cerebral pathologies. Diffusion restriction is visible as hyperintensity on DWI and as hypointensity on ADC maps. Due to the vicinity of multiple anatomic structures in the brain stem and hippocampus, very small lesions with diffusio...
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Objective To evaluate whole-lesion volumetric texture analysis of apparent diffusion coefficient (ADC) maps for assessing treatment response in prostate cancer bone metastases. Materials and methods Texture analysis is performed in 12 treatment-naïve patients with 34 metastases before treatment and at one, two, and three months after the initiatio...
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Diffusion-weighted imaging quantified using the mono-exponential model has shown great promise for monitoring treatment response in prostate cancer bone metastases. The aim of this prospective study is to evaluate whether non-mono-exponential diffusion models better describe the water diffusion properties and may improve treatment response assessme...
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Purpose: To demonstrate that fully navigated magnetic resonance spectroscopy (MRS) with inner-volume saturation (IVS) at 3 T results in high-quality spectra that permit evaluating metabolic changes in hepatic metastases without the need for patient compliance. Methods: Nine patients with untreated, biopsy-proven large hepatic metastases (minimum...
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Quantification of the impact of a lean transformation of a Swiss hospital. Data: 6178 Kaizen Ideas conducted in 6 Years. Result: 25 429 hours were saved
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The first-line therapy in metastatic renal cell carcinoma (mRCC), sunitinib, exhibits an objective response rate of approximately 30%. Therapeutic alternatives such as other tyrosine kinase inhibitors, VEGF inhibitors, or mTOR inhibitors emphasize the clinical need to predict the patient's response to sunitinib therapy before treatment initiation....
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Applicability of intravoxel incoherent motion (IVIM) imaging in the clinical setting is hampered by the limited reliability in particular of the perfusion-related parameter estimates. To alleviate this problem, various advanced postprocessing methods have been introduced. However, the underlying algorithms are not readily available and generally su...
Data
Flow chart depicting the simulation pipeline used in the present work. In addition, links to the locations of the source code that is used in the simulations are provided. (PDF)
Data
In-vivo SNR maps of three slices in the brain at b-values of 0, 100, 550, 1000 s/mm2. Please note that diffusion weighting at each b-value was applied along three orthogonal directions and the images were subsequently combined into a trace image. (DOCX)
Data
Mean values and standard deviations of the SNRs in the in-vivo measurements jointly computed across gray and white matter (NSA = 1). (DOCX)
Article
Objectives Aim was to investigate hygienic conditions of ultrasound probes before and after hygiene training in radiology institutions in comparison to bacterial contamination in public places. Methods In three radiology departments, bacterial contamination was evaluated using baseline agar plates for cultures taken from 36 ultrasound probes. After...
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Purpose To retrospectively evaluate whether prone CT scanning is superior to supine scanning for correct localization of distal urinary calculi in patients with acute flank pain. Methods Consecutively performed unenhanced CT scans in patients with acute flank pain were retrospectively analyzed in 150 patients in supine and another 150 patients in...
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Current report assessed measurement reproducibility and reliability of magnetic resonance spectroscopy (1H-MRS) at 3 Tesla in left and right posterior insular, pregenual and anterior midcingulate subdivisions. 10 healthy male volunteers aged 20 to 30 years were tested on four different days, of which 9 were included in the data analysis. Intra- and...
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Objective: To investigate whether a trained group of technicians using a modified breathing command during gadoxetate-enhanced liver MRI reduces respiratory motion artefacts compared to non-trained technicians using a traditional breathing command. Materials and methods: The gadoxetate-enhanced liver MR images of 30 patients acquired using the t...
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Purpose: To evaluate serial apparent diffusion coefficient (ADC) measurements of bone metastases in prostate cancer to determine whether antiandrogen resistance can be detected and time to progression estimated. Materials and methods: Diffusion-weighted imaging (DWI) was performed at 1.5T in nine patients with treatment-naïve metastatic prostate...
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Objectives: This study was conducted in order to compare a high resolution, non-contrast-enhanced MRA (NATIVE SPACE, NE-MRA) of the pedal vasculature with contrast-enhanced MRA (CE-MRA) and digital subtraction angiography (DSA) in patients with peripheral arterial occlusive disease (PAOD). Methods: The prospective study consists of 20 PAOD patie...
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To identify correlations of signal enhancements (SE) and SE normalized to reference tissues of the spleen, kidney, liver, musculus erector spinae (MES) and ductus hepatocholedochus (DHC) on hepatobiliary phase gadoxetate-enhanced MRI with patient age in non-cirrhotic patients. A heterogeneous cohort of 131 patients with different clinical backgroun...
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Introduction: The insular cortex is thought to play an important role in the pathophysiology of tobacco dependence. However, the effects of acute nicotine withdrawal and following nicotine substitution on neurometabolic changes in the insular cortex are still unknown. Method: A total of 14 male smokers and 10 male nonsmokers were investigated by ma...
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Objectives Optimal contrast within the pulmonary artery is achieved by the maximum amount of contrast-enhanced blood flowing through the superior vena cava (SVC), while minimum amounts of non-contrasted blood should originate from the inferior vena cava (IVC). This study aims to clarify whether “suction against resistance” might optimise this rati...
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Purpose: To compare revised Choi criteria that incorporate concurrent size and attenuation changes at early follow-up imaging with Response Evaluation Criteria in Solid Tumors ( RECIST Response Evaluation Criteria in Solid Tumors ) 1.1 and original Choi criteria in stratification of clinical outcomes in patients with metastatic renal cell carcinom...
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In Deutschland ist die Sepsis die dritthäufigste Todesursache. Bei etwa jedem 4. Patienten handelt es sich um eine Urosepsis. Aufgrund ihrer hohen Morbidität und Mortalität bleibt die Sepsis trotz großer Behandlungsfortschritte ein schweres Erkrankungsbild, welches rasches und interdisziplinäres Handeln erfordert. Neben vielfach vital bedrohlichen...
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This study introduces and validates the Hip Lag Sign, a new clinical parameter to determine hip abductor damage, which appears to be one major cause for greater trochanteric pain syndrome. 26 patients who underwent standardized MRI-examination were prospectively enrolledbetween October 2009 and March 2012. A standard physical examination of the hip...
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Liver steatosis is often observed in different clinical situations. Oncological patients undergoing systemic therapy often develop liver steatosis, which can be diagnosed with normal routine scans such as CT and ultrasound. In this case report, we show that an isolated infiltration of the portal triad with tumor cells could mimic a fatty-like infil...
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Objective: The insular cortex is thought to play an important role in the pathophysiology of tobacco dependence. However, the effects of acute nicotine withdrawal and following nicotine substitution on neurometabolic changes in the insular cortex are still unknown. Methods: A total of 14 male smokers and 10 male nonsmokers were investigated by magn...
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To evaluate gender differences of initial posters in threads dealing with bladder cancer on an online discussion board. 529 threads opened between 09/2005 and 03/2012 were screened on the largest German speaking bladder cancer online discussion board. 366 threads fulfilled the requirements for this study. Gender, age, number, status of concern and...
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Within the past 15 years, significant advances in the imaging of multiorgan and complex trauma primarily due to the improvement of cross-sectional imaging have resulted in the optimization of the expedient diagnosis and management of the polytrauma patient. At the forefront, multidetector computed tomography (MDCT) has become the cornerstone of mod...
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The purpose of this prospective study was to compare a 21G micropuncture needle with a regular 19G access needle for direct superficial femoral artery (SFA) access. A total of 100 consecutive patients were randomized to each group. Ultrasound-guided antegrade puncture of the SFA was performed using either a 21G or 19G needle. The time between injec...
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Objectives: To compare functional pelvic cine-MRI in patients with post-prostatectomy incontinence before and after implantation of a bulbourethral composite suspension. Patients and methods: Functional pelvic 1.5 T cine-MRI was performed at rest, under standardized Valsalva pressure and during micturition in six patients with post-prostatectomy...
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Lemierre's syndrome is characterized by anaerobic septicemia, internal jugular vein thrombosis, and septic emboli associated with infections of the head and neck. We describe an unusual and clinically confusing case of a young woman with an acute paresis of the abducens nerve and partial paresis of the right oculomotor nerve. After an extensive ima...
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Mesothelioma is the most common malignant primary tumor of the pleura and usually associated with inhalation of asbestos fibers. In contrast, peritoneal mesothelioma is a rare entity whose pathomechanism is not yet fully understood. The coexistence of pleural mesothelioma with secondary involvement of the abdominal cavity has not been addressed in...
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Solitary vertebral chordoma presents as an intra- and extraosseous tumour with typical bright signal on T2-weighted images and moderate inhomogeneous enhancement on T1 postcontrast images. The diffusion weighted imaging (DWI) characteristics of this histologically proven third lumbar vertebra chordoma are reported for the first time. The DWI hyperi...
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The aim of this study was to clarify whether addiction-specific neurometabolic reaction patterns occur in the insular cortex during acute nicotine withdrawal in tobacco smokers in comparison to nonsmokers. Fourteen male smokers and 10 male nonsmokers were included. Neurometabolites of the right and the left insular cortices were quantified by magne...
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Purpose: The present study was designed to evaluate the geometrical accuracy and clinical applicability of a new, free-hand, CT-guided, optical navigation system. Methods: Fifteen procedures in 14 consecutive patients were retrospectively analyzed. The navigation system was applied for interventional procedures on small target lesions, in cases...
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To optimize the diagnostic accuracy of the functional diffusion map for monitoring tumor treatment response in cancer patients. Using Monte Carlo simulations, measurement precision of the apparent diffusion coefficient (ADC), and particularly accuracy of threshold determination from healthy reference tissue, are evaluated by investigating the repea...
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Objectives: The insular cortex has an important role within the cerebral pain circuitry. The aim of this study was to measure metabolic alterations by MR spectroscopy due to experimentally induced trigeminal pain in the anterior/posterior and right/left insular subdivisions. Methods: Sixteen male volunteers were investigated using magnetic reson...
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Objective: To evaluate the association between hypertrophy of the tensor fasciae latae muscle and abductor tendon tears. Materials and methods: Thirty-five patients who underwent MRI of the abductor tendons of the hip were included in this retrospective study. A subgroup of 18 patients was examined bilaterally. The area of the tensor fasciae lat...
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The purpose of the present study was to analyze complications following antegrade puncture of the common femoral artery (CFA) and the superficial femoral artery (SFA) using vascular closure systems (VCS). A single-center, retrospective study was performed after obtaining approval from the institutional review board and informed consent from all pat...
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To evaluate prospectively duration and effectiveness of aperistalsis achieved by glucagon(GLU) or hyoscine N-butylbromide(HBB) following various administration routes. Six volunteers underwent Magnetic Resonance Imaging (MRI) after standardized oral preparation in random order five separate MR examinations with both spasmolytic agents (HBB intraven...